lxxxviii INFERIOR OOLITE AMMONITES. 



Locality and Stratum. — Dorset : Stoke Knap, in the Building Stone. 

 Bate of Existence. — Bradfordensis hemera, presumably. 



11. Ludwigella subobsoleta, 8. Buclcman. Suppl., Plate XIX, figs. 4 — 6. 



Description. — Graclumbilicate, subobsoleticostate. 



Remarks. — The small costse are few and distant; they are almost obsolete inside 

 the bend. 



Locality and Stratum. — Dorset : Bradford Abbas, Fossil Bed, presumably upper 

 part. 



Bate of Existence. — Biscitx hemera, presumably. 



Series B — Ludwigella cukve. 



Similar to Series A, but the ornament coarser in proportion, and the radial line 

 more curved. 



12. Ludwigella flexilis, S. Buclcman. Suppl., Plate XIX, figs. 28 — 30. 



Remarks. — The inner whorls up to about 6 mm. diameter are smooth. 



Bistinction. — Is like young Ludivigina patula, but has more rounded, slightly 

 thicker whorls, and a more fastigate periphery. The whorl of young L. patula is 

 subquadrate with subtabulate periphery, that of Ludl. flexilis rounded with arched 

 periphery. From Ludl. impolita, larger umbilicus. 



Locality and Stratum. — Dorset: Stoke Knap, in the Building Stone. 



Bate of Existence. — Bradfordensis hemera, presumably. 



13. Ludwigella callosa, S. Buclcman. Suppl., Plate XIX, figs. 16 — 18. 



Bistinction. — From L. impolita, thinner, and the more distant ornament is 

 rather coarser. 



Locality and Stratum. — Dorset: Sandford Lane, Sherborne (Bed 11, sect, ix, 

 p. fc93, 'Quart. Journ. Geol. Soc.,' vol. xlix, as " Lud. rudis"). 



Bate of Existence. — Concavi hemera. 



14. Ludwigella vibrata, S. Buclcman. Suppl., Plate XIX, fig. 13 — 15. 



Bistinction. — Something like Ludl. subrudis, but with more curved ribs. 

 Localities and Strata. — Dorset: Bradford Abbas, Fossil Bed; Somerset: 

 Stoford (Bed 11). 



Bate of Existence. — Concavi hemera. 



